Make namespace and server optional in discovery nomad

CHANGELOG.md

@@ -47,6 +47,8 @@ v0.37.2 (2023-10-16)
 - Fix an issue with the static to flow converter for blackbox exporter modules
   config not being included in the river output. (@erikbaranowski)
 
+- Fix issue with default values in `discovery.nomad`. (@marctc)
+
 ### Enhancements
 
 - Update Prometheus dependency to v2.47.2. (@tpaschalis)

component/discovery/nomad/nomad.go

@@ -27,10 +27,10 @@ func init() {
 type Arguments struct {
 	AllowStale       bool                    `river:"allow_stale,attr,optional"`
 	HTTPClientConfig config.HTTPClientConfig `river:",squash"`
-	Namespace        string                  `river:"namespace,attr"`
+	Namespace        string                  `river:"namespace,attr,optional"`
 	RefreshInterval  time.Duration           `river:"refresh_interval,attr,optional"`
 	Region           string                  `river:"region,attr,optional"`
-	Server           string                  `river:"server,attr"`
+	Server           string                  `river:"server,attr,optional"`
 	TagSeparator     string                  `river:"tag_separator,attr,optional"`
 }
 

docs/sources/flow/reference/components/discovery.nomad.md

@@ -16,7 +16,6 @@ description: Learn about discovery.nomad
 
 ```river
 discovery.nomad "LABEL" {
-  server = NOMAD_SERVER
 }
 ```
 
@@ -124,7 +123,6 @@ This example discovers targets from a Nomad server:
 
 ```river
 discovery.nomad "example" {
-  server = "localhost:8500"
 }
 
 prometheus.scrape "demo" {